Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Response Splitting')
The product receives data from an HTTP agent/component, and it places this data in HTTP response headers without neutralizing CRLF sequences.
An attacker can inject CRLF sequences into HTTP headers to create additional headers or response body content. This can lead to cache poisoning, cross-site scripting, or other attacks.
इस भेद्यता को कैसे ठीक करें
3 Shoulder डिटेक्शन नियमों पर आधारित HTTP Response Splitting के लिए रोकथाम रणनीतियाँ।
Strip CRLF characters from user input before setting HTTP headers
package main - import "net/http" - - func handler(w http.ResponseWriter, r *http.Request) { - lang := r.URL.Query().Get("lang") - // Vulnerable: user input set as header value - w.Header().Set("Content-Language", lang) + import ( + "net/http" + "strings" + ) + + func sanitizeHeaderValue(s string) string { + s = strings.ReplaceAll(s, "\r", "") + s = strings.ReplaceAll(s, "\n", "") + return s + } + + func handler(w http.ResponseWriter, r *http.Request) { + lang := r.URL.Query().Get("lang") + // Safe: CRLF characters stripped + w.Header().Set("Content-Language", sanitizeHeaderValue(lang)) w.Write([]byte("OK")) }
Strip CRLF characters from user input before using in HTTP headers
- from flask import request, make_response - - @app.route('/download') - def download(): - filename = request.args.get('filename') - response = make_response("content") - response.headers['Content-Disposition'] = f'attachment; filename="{filename}"' + import re + from flask import request, make_response + + def sanitize_header(value): + return re.sub(r'[\r\n]', '', str(value)) + + @app.route('/download') + def download(): + filename = request.args.get('filename', '') + safe_filename = sanitize_header(filename) + response = make_response("content") + response.headers['Content-Disposition'] = f'attachment; filename="{safe_filename}"' return response
अपने कोड में भेद्यताएँ खोजें
Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Response Splitting') पैटर्न के लिए अपने कोडबेस को स्कैन करने के लिए Shoulder का उपयोग करें। 3 नियम.
# Scan with Shoulder CLI npx @shoulderdev/cli trust --cwe=113 # Or scan entire project npx @shoulderdev/cli trust .
पहचान नियम (3)
कोड समीक्षा में किन बातों पर ध्यान दें
ये पैटर्न संभावित Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Response Splitting') भेद्यताओं का संकेत देते हैं। कोड समीक्षा और सुरक्षा ऑडिट के दौरान इन्हें देखें।
अपने कोडबेस को इसके लिए स्कैन करें: Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Response Splitting')
Shoulder CLI आपके पूरे कोडबेस में भेद्य पैटर्न खोजता है।